TWI506852B - Pcb antenna - Google Patents

Description

Board antenna

The present invention relates to a small-sized circuit board antenna.

The development of wireless communication technology has brought great convenience to people's lives. The antenna is one of the most important components in wireless communication equipment. In recent years, with the development of wireless communication equipment towards micro, small, light and thin, the antenna, as its main component, is also designed to occupy no space as much as possible to meet the development trend of unlimited communication equipment.

The main purpose of this creation is to provide a multi-frequency board antenna with a simple structure and small size.

In order to achieve the above object, the present invention can adopt the following technical solution: a circuit board antenna comprising an insulating substrate and a first conductive layer disposed on one side of the substrate, wherein the first conductive layer has a first side slot in the upper end, The middle slot is slotted with the second side, the first side slotted bottom forms a first feed point, the second side slotted bottom forms a second feed point, and the opposite side of the substrate is formed with a ground end.

The circuit board antenna of the invention has the following beneficial effects: simple structure, small size, good independence, easy manufacture and low cost.

100‧‧‧Board antenna

102‧‧‧Board antenna

104‧‧‧Board antenna

106‧‧‧Board antenna

120‧‧‧Substrate

200‧‧‧First conductive layer

22‧‧‧Intermediate slotting

222‧‧‧ third feed point

224‧‧‧镂孔

23‧‧‧First Extension

232‧‧‧ Large rounded corners

234‧‧‧镂孔

236‧‧‧ openings

237‧‧‧ openings

238‧‧‧镂孔

239‧‧ ‧ gap

24‧‧‧ first side slot

242‧‧‧First feed point

25‧‧‧Second extension

252‧‧‧镂孔

254‧‧‧ openings

256‧‧‧ openings

26‧‧‧Second side slotting

262‧‧‧second feed point

31‧‧‧ Return Loss Curve

32‧‧‧ Return Loss Curve

33‧‧‧ Return Loss Curve

41‧‧‧ standing wave ratio curve

42‧‧‧ standing wave ratio curve

43‧‧‧ standing wave ratio curve

400‧‧‧Second conductive layer

420‧‧‧ Grounding terminal

The first figure is a front view of a circuit board antenna according to a first embodiment of the present invention.

The second figure is a rear view of the board antenna shown in the first figure.

The third drawing is a front view of a circuit board antenna according to a second embodiment of the present invention.

The fourth figure is a rear view of the circuit board antenna shown in the third figure.

The fifth drawing is a front view of a circuit board antenna according to a third embodiment of the present invention.

Figure 6 is a rear view of the board antenna shown in Figure 5.

The seventh drawing is a front view of a circuit board antenna according to a fourth embodiment of the present invention.

Figure 8 is a rear view of the board antenna shown in Figure 7.

The ninth drawing is a perspective view of the circuit board antenna shown in the fifth and sixth figures.

Figure 11 is another perspective view of the circuit board antenna shown in Figure IX.

The eleventh figure is a return loss diagram of the circuit board antenna of the third embodiment.

Figure 12 is a diagram showing the standing wave ratio of the third embodiment of the board antenna.

The circuit board antenna of the present invention is a multi-frequency circuit board antenna (2.4 GHz and 5.0 GHz) operating in Wireless Local Area Networks (WLAN), which is commonly used for a USB flash drive. Please refer to the first to eighth figures, which are shown in the four embodiments of the present invention. The ninth and tenth aspects are perspective views of the circuit board antenna according to the third embodiment of the present invention, and the perspective views of other embodiments are similar. Not one by one.

The first and second figures disclose the board antenna 100 of the first embodiment. The circuit board antenna 100 includes a rectangular insulating substrate 120 and a first conductive layer 200 disposed on a side of the substrate 120. The rectangular insulating substrate 120 has a long side and a short side. The shape of the first conductive layer 200 is symmetrical with respect to the center line of the substrate 120 parallel to the long side, and has The upper end short side position sequentially has a first side groove 24, an intermediate groove 22, and a second side groove 26 extending in the longitudinal direction. The first side slot 24 is the same depth as the second side slot 26 and is greater than the depth of the intermediate slot 22. The first conductive layer 200 forms two first extensions 23 between the intermediate slot 22 and the first side slot 24 and the second side slot 26. The ends of the two first extensions 23 are formed parallel to the short sides. An edge, and the end of the first extending portion 23 is spaced apart from an upper end edge of the insulating substrate 120. The first conductive layer 200 forms two second extending portions 25 on the outer sides of the first side slits 24 and the second side slits 26, and the width of the first extending portion 23 is much larger than (more than three times) the width of the second extending portion 25. And the length of the second extension portion 25 extending upward is smaller than the length of the first extension portion 23. A first feed point 242 is formed at the bottom of the first side slot 24, a second feed point 262 is formed at the bottom of the second side slot 26, and the intermediate slot 22 forms a third feed point 222. The first conductive layer 200 is formed with a bore 224 at a lower side of the first feed point 242, the second feed point 262, and the third feed point 222. The opposite side of the substrate 120 is formed with an elongated second conductive layer 400 extending parallel to the short side, the second conductive layer 400 being adjacent to the first side slot 24 and on the upper side of the bottom of the intermediate slot 22 The grounding end 420 is disposed on the second conductive layer 400 near one end of the first side slot 24.

The third and fourth figures disclose the board antenna 102 of the second embodiment. Compared with the first embodiment, the second embodiment differs in the following two points: First, the ends of the two first extending portions 23 of the first conductive layer 200 are respectively provided with large rounded corners 232 facing the intermediate slots 22 (the radius is larger than The width of the first extension portion 23); secondly, the first extension portion 23 is provided with a pupil 234 extending parallel to the longitudinal direction of the substrate 120 at a position close to the first side slot 24 or the second side slot 26, and two turns The holes 234 each have an opening 236 that extends through the first side slot 24 or the second side slot 26.

The fifth and sixth figures disclose the board antenna 104 of the third embodiment. With the first implementation Compared with the third embodiment, the third embodiment differs in the following three points: First, the ends of the two first extending portions 23 of the first conductive layer 200 are respectively provided with large rounded corners 232 facing the intermediate slots 22; second, each second Each of the extending portions 25 is provided with a bore 252 extending parallel to the longitudinal direction of the substrate 120, and the two bores 252 respectively have openings 254, 256 extending through the outer sides of the corresponding slots 24, 26 and the two second extending portions 25; The second extension 25 extends to the same length as the first extension 23 .

The seventh and eighth figures disclose the circuit board antenna 106 of the fourth embodiment. Compared with the first embodiment, the fourth embodiment differs in the following three points: First, the ends of the two first extending portions 23 of the first conductive layer 200 are respectively provided with large rounded corners 232 facing the intermediate slots 22; The first extending portion 23 is provided with a bore 238 extending parallel to the longitudinal direction of the substrate 120 near the first side slot 24 or the second side slot, and the bore 238 has a through-corresponding first side slot 24 or The opening 237 of the second side slot 26; the third end of the first extending portion 23 faces the first side slot 24 or the second side slot 26 is provided with a notch 239.

In the foregoing four embodiments, each feed point corresponds to one antenna. See Figure 11 for the return loss plot of the three antennas. The horizontal axis is the frequency in gigahertz (GHz) and the vertical axis is the loss ratio in dB. The first feed point 242 corresponds to the return loss curve 31 of the antenna, the second feed point 262 corresponds to the return loss curve 32 of the antenna, and the third feed point 222 corresponds to the return loss curve 33 of the antenna. It can be seen from the figure that the return loss of the three antennas is less than minus 0.65 dB. See Figure 12 for the standing wave ratio diagram of the three antennas. The horizontal axis is the frequency in gigahertz (GHz) and the vertical axis is the standing wave ratio. The first feed point 242 corresponds to the standing wave ratio curve 41 of the antenna, the second feed point 262 corresponds to the standing wave ratio curve 42 of the antenna, and the third feed point 222 corresponds to the standing wave ratio curve 43 of the antenna. As can be seen from the figure, the three antennas are at 2.4 GHz. The standing wave ratio of the 5.0 GHz frequency is less than 3.

In addition, in the foregoing four embodiments, the third feed point 222 may not be designed as needed, so only two corresponding antennas are formed.

Compared with the prior art, the plurality of antennas of the circuit board antenna of the present invention are simple in structure, small in size, good in independence, easy to manufacture, and low in cost.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or variations in accordance with the spirit of the present invention. It should be covered by the following patent application.

104‧‧‧Board antenna

200‧‧‧First conductive layer

Claims (10)

A circuit board antenna comprising: an insulating substrate; and a first conductive layer disposed on one side of the substrate, the first conductive layer having a first side slot, an intermediate slot, and a second side slot in sequence at an upper end The first side slotted bottom forms a first feed point, the second side slotted bottom forms a second feed point, and the opposite side of the substrate is formed with a ground end. The circuit board antenna of claim 1, wherein the bottom of the middle slot is provided with a third feed point. The circuit board antenna of claim 1, wherein the first conductive layer is formed with an extension portion on both sides of the first side groove, the intermediate groove and the second side groove, and the extension portion is provided with a bore. The circuit board antenna according to claim 1, wherein the substrate has a rectangular shape and has short sides at upper and lower ends and long sides on both sides. The circuit board antenna of claim 4, wherein the first conductive layer has a first extension arm between the intermediate slot and the first side slot and the second side slot, and is on the first side Two slots are disposed on the outer side of the slot and the second side slot, and the first extension arm is provided with an elongated pupil adjacent to the first side slot, the pupil extending parallel to the long side of the substrate. The circuit board antenna of claim 5, wherein the width of the first extension arm is greater than three times the width of the second extension arm. The circuit board antenna of claim 6, wherein the ends of the first extension arm and the second extension arm are provided with rounded corners facing the intermediate slot. The circuit board antenna of claim 6, wherein the extension length of the first extension arm is greater than the extension length of the second extension arm. The circuit board antenna of claim 4, wherein the grounding end is a second conductive layer disposed on a side of the substrate opposite to the first conductive layer, the second conductive layer being elongated and parallel to the substrate Extends in the width direction. The circuit board antenna of claim 9, wherein the grounding end is disposed adjacent to the first side slotted position.